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OpenStudy (anonymous):
Robert is twice as old as Marie. Six years ago the sum of their ages was 39. How old are they now?
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OpenStudy (alexandervonhumboldt2):
r=2m r+m-6-6=39
OpenStudy (alexandervonhumboldt2):
solve this sytem of equations r=2m r+m=27
OpenStudy (alexandervonhumboldt2):
3m=27 m=9 m=9 r=18
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